InterDigital officer has 325 shares withheld for tax

Rhea-AI Filing Summary

InterDigital, Inc. (IDCC) reported that Chief Licensing Officer Julia C. Mattis disposed of shares on September 15, 2026 in connection with vesting of restricted stock units, consisting of 325 shares withheld to pay tax liabilities and a separate small disposition tied to fractional-share cash settlement, with no open-market trades reported.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Mattis Julia C

Role Chief Licensing Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	325	$340.38	$111K
Disposition	Common Stock F2	0.8225	$340.38	$279.96

Holdings After Transaction: Common Stock — 11,236.2977 shares (Direct)

Footnotes (2)

1. F1. The transaction reported reflects the withholding of restricted stock units in satisfaction of the reporting person's tax liability. The restricted stock units were granted to the reporting person on September 15, 2024 pursuant to the company's 2017 Equity Incentive Plan in accordance with the company's long-term compensation program and vested on September 15, 2026, together with accrued dividend equivalents.
2. F2. The transaction reported reflects the cash settlement of fractional shares in connection with the vesting of restricted stock units, as described in the previous footnote.

Key Figures

Shares withheld for tax liability: 325 shares Shares disposed for fractional-share settlement: 0.8225 shares Reference price per share: $340.38 per share +3 more

6 metrics

Shares withheld for tax liability 325 shares Common stock withheld on September 15, 2026 in connection with RSU vesting

Shares disposed for fractional-share settlement 0.8225 shares Common stock tied to cash settlement of fractional shares on September 15, 2026

Reference price per share $340.38 per share Used for both the tax-withholding and fractional-share dispositions

RSU grant date September 15, 2024 Grant of restricted stock units under the 2017 Equity Incentive Plan

RSU vesting date September 15, 2026 Vesting of RSUs together with accrued dividend equivalents

Shares used for exercise price or tax liability 325 shares Total shares reported under code F for tax-liability payment

Key Terms

restricted stock units, dividend equivalents, 2017 Equity Incentive Plan, cash settlement, +1 more

5 terms

restricted stock units financial

"The transaction reported reflects the withholding of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

dividend equivalents financial

"vested on September 15, 2026, together with accrued dividend equivalents"

Payments tied to employee or contractor equity awards that mirror the cash dividends paid on the company’s stock; they give the holder the same economic benefit as owning the shares without transferring actual shares—often paid in cash or additional award units when the award becomes payable. Investors care because these payments affect a company’s compensation costs, cash flow and potential share dilution, and they signal how management is being rewarded and aligned with shareholders.

2017 Equity Incentive Plan financial

"granted to the reporting person on September 15, 2024 pursuant to the company's 2017 Equity Incentive Plan"

cash settlement financial

"reflects the cash settlement of fractional shares in connection with the vesting"

Cash settlement is a process where, instead of exchanging physical assets like stocks or commodities, the parties involved settle the difference in value with money after a contract ends. For investors, it simplifies transactions by avoiding the need to handle or deliver the actual asset, making it quicker and more convenient to complete trades. This method ensures a straightforward way to settle agreements based on their final value.

fractional shares financial

"cash settlement of fractional shares in connection with the vesting of restricted stock units"

Fractional shares are portions of a whole share of a stock or fund, allowing investors to own less than one full unit. They make it possible to invest a specific dollar amount rather than buy whole shares, like buying a slice of a pizza instead of the entire pie. For investors this lowers the cost barrier, helps with diversification, and lets you reinvest dividends or purchase expensive stocks in small, precise amounts.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did IDCC’s Chief Licensing Officer report on this Form 4?

The filing reports that Chief Licensing Officer Julia C. Mattis had 325 shares of InterDigital common stock withheld to satisfy tax obligations on vesting restricted stock units, plus a small disposition related to fractional-share cash settlement, all on September 15, 2026.

Were the IDCC insider transactions open-market buys or sells?

No. The transactions were non-open‑market events: 325 shares were withheld to pay tax liabilities from vesting restricted stock units and an additional 0.8225 shares were disposed of in connection with cash settlement of fractional shares.

What price per share is associated with the IDCC insider’s reported transactions?

Both reported transactions use a price of $340.38 per share for InterDigital common stock in calculating the tax-withholding of 325 shares and the disposition of 0.8225 fractional shares on September 15, 2026.

What is the source of the restricted stock units in the IDCC Form 4?

The restricted stock units were granted to Julia C. Mattis on September 15, 2024 under InterDigital’s 2017 Equity Incentive Plan as part of its long‑term compensation program and vested on September 15, 2026, including accrued dividend equivalents.

Was a Rule 10b5-1 trading plan involved in the IDCC insider transactions?

No. The Form 4 indicates no Rule 10b5‑1 trading plan for these transactions; they arise from automatic tax withholding and fractional-share cash settlement tied to the vesting of restricted stock units rather than discretionary market trades.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/17/2026 - 08:00 AM Accepted by SEC EDGAR 09/17/2026 - 07:59 AM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mattis Julia C

(Last) (First) (Middle)

200 BELLEVUE PARKWAY

SUITE 300

(Street)

WILMINGTON DELAWARE 19809

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
InterDigital, Inc. [ IDCC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Licensing Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/15/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/15/2026		F(1)		325	D	$340.38	11,237.1202	D
Common Stock	09/15/2026		D(2)		0.8225	D	$340.38	11,236.2977	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The transaction reported reflects the withholding of restricted stock units in satisfaction of the reporting person's tax liability. The restricted stock units were granted to the reporting person on September 15, 2024 pursuant to the company's 2017 Equity Incentive Plan in accordance with the company's long-term compensation program and vested on September 15, 2026, together with accrued dividend equivalents.

2. The transaction reported reflects the cash settlement of fractional shares in connection with the vesting of restricted stock units, as described in the previous footnote.

Remarks:

	/s/ Ariel E. Greenstein, Attorney-in-Fact for Julia C. Mattis	09/17/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)